[PATCH 0/4] usb: dwc2: Add USB DRD support on CV1800 Series SoC

[Inochi Amaoto]

The current DRD implementation of DRD will cause a interrupt flow on
CV1800 Series SoC. It has two reasons:
1. The DRD does not sync the phy mode when change the controller mode,
   it is a violation of the DRD as it does not rely on a OTG phy.
2. The CV1800 is entered with a Session End Detected interrupt, but the
   DRD code has no change on it, so the controller will enter the
   interrupt storm.

This patch add fixes for these two problem, and I have tested this on
a Huashan PI board (it has a CV1812H SoC).

Note: This patches set does not resolve all the problems, as
      usb_add_hcd() will override the role set by dwc2, but I am not
      sure whether it should change skip_phy_initialization of hcd.
      So I kept it as it is and users still needs to set the role
      in the userspace as "role-switch-default-mode" in devicetree
      takes no effect.

Inochi Amaoto (4):
  usb: dwc2: gadget: honor pullup requests in core_connect
  usb: dwc2: drd: Sync the generic PHY mode with role requests
  usb: dwc2: Add USB DRD support on CV1800 series SoC
  riscv: dts: sophgo: Enable USB role switch on Huashan PI

 .../boot/dts/sophgo/cv1812h-huashan-pi.dts    |  4 +-
 drivers/usb/dwc2/core.h                       |  5 +-
 drivers/usb/dwc2/drd.c                        | 77 +++++++++++++++----
 drivers/usb/dwc2/gadget.c                     |  3 +-
 drivers/usb/dwc2/params.c                     |  1 +
 drivers/usb/dwc2/platform.c                   |  4 +-
 6 files changed, 73 insertions(+), 21 deletions(-)

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2.56.0